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This case report presents a patient with necrobiosis lipoidica exhibiting transepithelial elimination of cholesterol crystals through hair follicles, a finding previously associated with necrobiotic xanthogranuloma.

This article discusses eruptive vellus hair cysts, detailing their appearance, distribution, histology, and potential spontaneous resolution, but reports no new clinical findings on treatment.

In this case study, a 62-year-old male with a history of uncontrolled diabetes and chronic kidney disease was diagnosed with perforating folliculitis after presenting with dark, raised, pruritic lesions on his limbs, confirmed by histopathological examination showing collagen extruding into hair follicles.

This article reports the first case of perforating necrobiosis lipoidica in Colombia and the 19th case worldwide in diabetic patients.

This case study highlights a 20-year-old male with perforating folliculitis, proposing its classification within primary perforating dermatoses, and discusses failed keratolytic treatments and potential underlying causes.